I’m not aware of an indoor Lutron smart plug. I know they have an indoor plug in lamp dimmer but that can only be used for lamps. Curiosity got the better of me so I checked the website. Doesn’t look like they have such a device in existence.
If you’re looking to offload some strain on your WiFi, I know Philips Hue and Aqara have Zigbee based smart plugs. Hub required of course, but worth a mention in case you already have a hub or interested in expanding.
I know Wemo gets a lot of flack in the smart home community. I have seven of the original smart plugs for the past six + years when they were the affordable brand on the market. For the first year or so, yeah I admit, they sucked. A lot of drops. But for the past 4+ years, they’ve been some of my most reliable accessories in HomeKit. It was around the time they switched to cloud based. I lose power, internet, whatever, and they pop right back into action when everything is restored without any input from me. Not undermining your experience at all. 100 people can’t be wrong but I’m wondering why the difference in experience with them. Their doorbell, now that was a nightmare lol.
Edit*. Just re-read your post. Yeah Aqara stuff is just plain good. Since you already have the hub. The only thing with their plugs is, by design, you can only use one per outlet box.